Chemical plant protection is still an indispensable method in effective potato protection against Colorado potato beetle – CPB – (Leptinotarsa decemlineata Say) in Poland. This species is able to develop strong resistance against all active substances used in chemical and biological insecticides. The phenomenon of resistance is variable in time and in space. Therefore the objective of the study was to determine the present susceptibility level of Polish populations of CPB to main groups of insecticides recommended in Poland for CPB control.
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